The formulas above are quite general, and can be generalized further to any correlator across the wormhole, and in fact, using a discussion similar to REF , can be generalized to particles entering from the past singularity or leaving through the future singularity. Here we will have a more modest goal of just testing our machinery using the two sided correlator in the shock wave [1]}. The shock wave is a particularly convenient background as the two-sided correlation function was evaluated for any length/shockwave strength, and it plays a key role in the study of quantum chaos in black holes.
